Automatic text wrapping/text box filling

many people have written scripts to do this and it's relatively easy with the library's getsize func but I feel like it really should be a built-in feature.

i think there should be a draw_text_box or similar function which has these properties on top of the existing draw_multiline_text:

• you can specify a max width in pixels and Pillow will automatically insert line breaks to keep the text's width under the max width
  • I think there should be an option to only break at word boundaries unless the word exceeds the max width, like the CSS word-break property
• you can specify a max height in pixels with one of two behaviors:
  • when reaching the max height, the text box is clipped and doesn't draw any more.
  • when reaching the max height, the font size is gradually reduced until the text fits inside
    • I think a min font size property would be useful here
  • also an option to find the biggest font size that fits within the text box
    • a max font size property would be useful here

I'm not very experienced with the library internals or C in general so for now I won't make a pull, I just want to throw the idea out there to the devs

Start with the existing draw_multiline_text and getsize APIs and compare the linked script for current wrapping behavior. Clarify which width, height, clipping, and font-size behaviors are in scope before coding; done should be a defined text-box API with the selected behaviors covered by tests.